Function FromHeader

extractors/extractors.go:342–354

FromHeader creates an Extractor that retrieves a value from a specified HTTP header in the request. HTTP headers are commonly used for API keys, tokens, and other metadata. The function: - Retrieves the header value using the specified name - Returns ErrNotFound if the header is missing Parameters

(header string)

//	// Header: "X-API-Key: abc123" -> Output: "abc123"
//	// Missing header -> Output: ErrNotFound
func FromHeader(header string) Extractor {
	return Extractor{
		Extract: func(c fiber.Ctx) (string, error) {
			value := c.Get(header)
			if value == "" {
				return "", ErrNotFound
			}
			return value, nil
		},
		Key:    header,
		Source: SourceHeader,
	}
}

// FromQuery creates an Extractor that retrieves a value from a specified query parameter in the request.
// Query parameters are extracted from the URL query string (e.g., ?key=value&foo=bar).